Display Panel Temperature Sensing via Flexible Circuit Nesting
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Solution Overview
Problem
Display devices face challenges in accurately measuring temperature, which affects the lifespan of transistors and light emitting devices, as existing methods lack effective techniques for determining normal temperature values in display panels.
Innovation Solution
A display device with a temperature sensing system that includes a temperature sensor adjacent to a sensing pixel, connected via a flexible circuit board, allowing for the calculation of a reference temperature value during a black mode and comparison with a threshold to determine normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is disposed on the printed circuit board adjacent to the sensing pixel, then temperature measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The temperature sensor is disposed on the printed circuit board which is located underneath the display panel, nesting the temperature sensing function within the existing device structure. The flexible circuit board connects the sensing pixel on the display panel to the temperature sensor on the printed circuit board, allowing the temperature sensor to measure the temperature of the display panel indirectly through thermal conduction without adding complex external sensing structures.
2Volume of moving object
If the flexible circuit board is bent to dispose the printed circuit board under the display panel, then space utilization is improved, but manufacturing difficulty increases
Solution Approach 1:
The flexible circuit board is bent into a specific configuration to position the printed circuit board underneath the display panel, utilizing the flexibility of the material to achieve compact space utilization. This dynamic positioning allows the temperature sensor to be located close to the sensing pixel while maintaining electrical connectivity through the bent flexible circuit board.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate determination of normal temperature values, reducing errors and ensuring optimal operation of display devices by indirectly measuring temperature through sensing currents, thus extending the lifespan of components.
Implementation Method 1
The pixels include transistors and light emitting devices connected to the transistors. The transistors and the light emitting devices are affected by a temperature of the display panel. The lifetime of the transistors and the light emitting devices may vary depending on the temperature.
Implementation Method 2
a temperature sensor disposed on the printed circuit board... a temperature sensing part disposed on the printed circuit board... determining whether the reference temperature value is normal by comparing a difference value between a temperature value measured by a temperature sensor adjacent to the sensing pixel and the reference temperature value
Data Source
AI summary
A display device is disclosed that includes a display panel including a plurality of pixels, a printed circuit board connected to the display panel, a temperature sensor disposed on the printed circuit board, a flexible circuit board that connects the display panel to the printed circuit board, a data driver disposed on the flexible circuit board, and a temperature sensing part disposed on the printed circuit board. The flexible circuit board is bent such that the printed circuit board is disposed under the display panel and the temperature sensor is disposed adjacent to a sensing pixel outputting a sensing current among the pixels.